22._____ computer has been proved to be _____ important aid in classroom teaching.
I can hear the Browns' phone bell ringing but no one is answering it; they _______ be at home.
The meeting had been on for half an hour _______ Miss Yang turned up.
—I really like the White Princess _______ by Kelly Chan. —She has gift of performance as well as singing.
I can't see any coffee in this cupboard. _______?
The doctor advised Joyce strongly that she should take a holiday, but _______ didn't help.